test(policy): add extra testing of the matching algorithm

[lahabana]

• Add some tests to the policy matching algo
• Add possibility to add a test as pending in test.EntriesForFolder

Ref #8484

Checklist prior to review

• Link to relevant issue as well as docs and UI issues --
• This will not break child repos: it doesn't hardcode values (.e.g "kumahq" as a image registry) and it will work on Windows, system specific functions like syscall.Mkfifo have equivalent implementation on the other OS --
• Tests (Unit test, E2E tests, manual test on universal and k8s) --
  • Don't forget ci/ labels to run additional/fewer tests
• Do you need to update UPGRADE.md? --
• Does it need to be backported according to the backporting policy? (this GH action will add "backport" label based on these file globs, if you want to prevent it from adding the "backport" label use no-backport-autolabel label) --

[lobkovilya]

Tests in this PR are not expected to pass, because sorting normally is happening here

kuma/pkg/plugins/policies/core/matchers/dataplane.go

Lines 63 to 67 in b249dab

	sort.Sort(ByTargetRef(dpPolicies))
	for _, ps := range matchedPoliciesByInbound {
	sort.Sort(ByTargetRef(ps))
	}

But the test calls core_rules.BuildFromRules function that already expects sorted policies as input.

[lobkovilya]

If you place the same test here pkg/plugins/policies/core/matchers/dataplane_test.go, it works as expected.

[lahabana]

Yeah that's what I've noticed later

[lahabana]

Yeah I noticed that after so I added tests there as well and it seems to be working correctly.
As you pointed out in the issue the problem is related to k8s policy naming so I've renamed this PR and we can just add these tests as the policy matching algo is a little light in tests.